Years ago, i told Gabriel Russo about this fun idea and he loved it and designed at the same moment. 
It's fun to think that years later it became just sort of a "internet meme", as we call it in Brazil, being spread in worldwide portals like 9gag, Ffffound, Adsoftheworld and many others. 

* Note: this actually never existed. We tried to do so, but Fox and Groening didn't get thrilled with it.  
It also inspired a german graffiti artist and he put some DIY in our idea back in Frankfurt subway stairs:
Thank you so much anonymous street artist.